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Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Allowance for Doubtful Accounts    
Balance at Beginning of Period   $ 5,907
Charged to Expense   4,997
Deductions/Transfers $ 0 (3,722)
Balance at End of Period $ 0 $ 7,182